Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What type of curve is observed when plotting the length of an organ against time in arithmetic growth?
As stated in the NCERT text, 'On plotting the length of the organ against time, a linear curve is obtained' for arithmetic growth.
In the context of the exponential growth formula $W_1 = W_0 e^{rt}$, what does '$e$' represent?
The NCERT explicitly states: '$e$ = base of natural logarithms' in the exponential growth equation.
Which of the following is NOT a necessary condition for plant growth mentioned in the text?
The text lists water, oxygen, and nutrients as 'very essential elements for growth.' While gravity affects certain phases/stages of growth, it is described as an 'environmental signal' rather than a 'necessary condition' in the same primary sense as water, oxygen, and nutrients for growth processes like cell enlargement and metabolic energy.
What is the term for the growth of a given system per unit time expressed on a common basis, e.g., per unit initial parameter?
NCERT defines it: 'The growth of the given system per unit time expressed on a common basis, e.g., per unit initial parameter is called the relative growth rate.'
In geometric growth, what causes the growth to slow down, leading to a stationary phase?
According to the NCERT text, 'However, with limited nutrient supply, the growth slows down leading to a stationary phase' in geometric growth.
Which type of growth is characteristic of living organisms growing in a natural environment and typically produces an S-curve?
NCERT states, 'If we plot the parameter of growth against time, we get a typical sigmoid or S-curve (Figure 13.6). A sigmoid curve is a characteristic of living organism growing in a natural environment' which refers to geometric growth.
What is the primary role of water in plant growth, as described in the context?
The text explains: 'The plant cells grow in size by cell enlargement which in turn requires water. Turgidity of cells helps in extension growth. Thus, plant growth and further development is intimately linked to the water status of the plant. Water also provides the medium for enzymatic activities needed for growth.'
Which phase of growth is characterized by cells attaining their maximal size in terms of wall thickening and protoplasmic modifications?
NCERT mentions, 'Further away from the apex, i.e., more proximal to the phase of elongation, lies the portion of axis which is undergoing the phase of maturation. The cells of this zone, attain their maximal size in terms of wall thickening and protoplasmic modifications.'
What is the initial phase of geometric growth often associated with slow growth?
In geometric growth, 'the initial growth is slow (lag phase), and it increases rapidly thereafter – at an exponential rate (log or exponential phase).'
In arithmetic growth, if the length at time zero ($L_0$) is 10 mm and the growth rate ($r$) is 2 mm/day, what will be the length ($L_t$) after 5 days?
Using the arithmetic growth formula $L_t = L_0 + rt$: $L_t = 10 ext{ mm} + (2 ext{ mm/day} imes 5 ext{ days}) = 10 ext{ mm} + 10 ext{ mm} = 20 ext{ mm}$.
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